Can toluene or xylene form clathrate hydrates? / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5916–5918 Titre : Can toluene or xylene form clathrate hydrates? Type de document : texte imprimé Auteurs : Amir H. Mohammadi, Auteur ; Veronica Belandria, Auteur ; Dominique Richon, Auteur Année de publication : 2009 Article en page(s) : pp. 5916–5918 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Toluene p-xylene Clathrate hydrate formation Résumé : In this communication, we examine the possibility of clathrate hydrate formation of toluene and o-, m-, or p-xylene with methane as help gas. An isochoric pressure-search method was used to measure hydrate phase equilibrium boundaries. The reliability of this method is tested by generating hydrate phase equilibrium boundary data for the methane−benzene−water system and comparing them with experimental data reported in the literature. The acceptable agreements demonstrate the reliability of the technique used in this work. The new experimental data of hydrate phase equilibrium boundary for the methane−(toluene/(o/m/p)-xylene)−water systems are compared with some selected experimental data from the literature for the methane−water system to study the possibility of shifting the hydrate phase equilibrium boundary of the latter system by the presence of toluene and o-, m-, or p-xylene. It is shown that toluene and o-, m-, or p-xylene have little or almost no effect on the hydrate phase equilibrium boundary of the methane−water system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900362v [article] Can toluene or xylene form clathrate hydrates? [texte imprimé] / Amir H. Mohammadi, Auteur ; Veronica Belandria, Auteur ; Dominique Richon, Auteur . - 2009 . - pp. 5916–5918. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5916–5918 Mots-clés : Toluene p-xylene Clathrate hydrate formation Résumé : In this communication, we examine the possibility of clathrate hydrate formation of toluene and o-, m-, or p-xylene with methane as help gas. An isochoric pressure-search method was used to measure hydrate phase equilibrium boundaries. The reliability of this method is tested by generating hydrate phase equilibrium boundary data for the methane−benzene−water system and comparing them with experimental data reported in the literature. The acceptable agreements demonstrate the reliability of the technique used in this work. The new experimental data of hydrate phase equilibrium boundary for the methane−(toluene/(o/m/p)-xylene)−water systems are compared with some selected experimental data from the literature for the methane−water system to study the possibility of shifting the hydrate phase equilibrium boundary of the latter system by the presence of toluene and o-, m-, or p-xylene. It is shown that toluene and o-, m-, or p-xylene have little or almost no effect on the hydrate phase equilibrium boundary of the methane−water system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900362v

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Determination of sulfur content of various gases using chrastil-type equations / Ali Eslamimanesh in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7682-7687 Titre : Determination of sulfur content of various gases using chrastil-type equations Type de document : texte imprimé Auteurs : Ali Eslamimanesh, Auteur ; Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur Année de publication : 2011 Article en page(s) : pp. 7682-7687 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Natural gases Chrastil-type equations Résumé : Accurate knowledge of the sulfur content of gases is a significant factor for prediction of the sulfur precipitation conditions in production of sour natural gases. However, because the concentration of sulfur in the gas phase is very low, the measurement difficulties consequently result in scarce experimental solubility values available in the literature. In this work, application of four commonly used Chrastil-type equations including the original Chrastil, Adachi and Lu, del Valle and Aguilera, and Mèndez-Santiago and Teja, which consider the effects of temperature, density of gas (solvent), and pressures on the sulfur solubility, are investigated to calculate the sulfur content of different gases at various temperature, pressure, and sulfur content ranges. In this study, sulfur is treated as single molecule S8. The Valderrama-Patel-Teja equation of state with non-density dependent mixing rules is used to calculate the densities ofgases. It is found out that the absolute average deviations (AAD %) of the evaluated sulfur contents by the aforementioned equations for 260 investigated experimental values are 21%, 12%, 19%, and 20%, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239085 [article] Determination of sulfur content of various gases using chrastil-type equations [texte imprimé] / Ali Eslamimanesh, Auteur ; Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur . - 2011 . - pp. 7682-7687. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7682-7687 Mots-clés : Natural gases Chrastil-type equations Résumé : Accurate knowledge of the sulfur content of gases is a significant factor for prediction of the sulfur precipitation conditions in production of sour natural gases. However, because the concentration of sulfur in the gas phase is very low, the measurement difficulties consequently result in scarce experimental solubility values available in the literature. In this work, application of four commonly used Chrastil-type equations including the original Chrastil, Adachi and Lu, del Valle and Aguilera, and Mèndez-Santiago and Teja, which consider the effects of temperature, density of gas (solvent), and pressures on the sulfur solubility, are investigated to calculate the sulfur content of different gases at various temperature, pressure, and sulfur content ranges. In this study, sulfur is treated as single molecule S8. The Valderrama-Patel-Teja equation of state with non-density dependent mixing rules is used to calculate the densities ofgases. It is found out that the absolute average deviations (AAD %) of the evaluated sulfur contents by the aforementioned equations for 260 investigated experimental values are 21%, 12%, 19%, and 20%, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239085

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Estimating Sulfur Content of Hydrog Sulfide at elevated temperatures and Pressures using an Atificial Neural Network Algorithm / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8499–8504 Titre : Estimating Sulfur Content of Hydrog Sulfide at elevated temperatures and Pressures using an Atificial Neural Network Algorithm Type de document : texte imprimé Auteurs : Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur Année de publication : 2008 Article en page(s) : p. 8499–8504 Note générale : chemical engineering Langues : Anglais (eng) Résumé : In this communication, we report an artificial neural network algorithm for estimating sulfur content of hydrogen sulfide at elevated temperatures and pressures. This model eliminates any need for characterization parameters, due to the tendency of sulfurs to react, required in thermodynamic models. To develop this algorithm, reliable experimental data reported in the literature on sulfur content of hydrogen sulfide are used. The developed model is then used to predict independent experimental data (not used in developing the model). It is shown that artificial neural network algorithm can be used as an efficient tool to estimate sulfur content of hydrogen sulfide. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004463 [article] Estimating Sulfur Content of Hydrog Sulfide at elevated temperatures and Pressures using an Atificial Neural Network Algorithm [texte imprimé] / Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur . - 2008 . - p. 8499–8504. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8499–8504 Résumé : In this communication, we report an artificial neural network algorithm for estimating sulfur content of hydrogen sulfide at elevated temperatures and pressures. This model eliminates any need for characterization parameters, due to the tendency of sulfurs to react, required in thermodynamic models. To develop this algorithm, reliable experimental data reported in the literature on sulfur content of hydrogen sulfide are used. The developed model is then used to predict independent experimental data (not used in developing the model). It is shown that artificial neural network algorithm can be used as an efficient tool to estimate sulfur content of hydrogen sulfide. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004463

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Extension of an artificial neural network algorithm for estimating sulfur content of sour gases at elevated temperatures and pressures / Mehdi Mehrpooya in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 439–442 Titre : Extension of an artificial neural network algorithm for estimating sulfur content of sour gases at elevated temperatures and pressures Type de document : texte imprimé Auteurs : Mehdi Mehrpooya, Auteur ; Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur Année de publication : 2010 Article en page(s) : pp. 439–442 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Extension--Artificial--Neural--Network--Algorithm--Estimating--Sulfur--Gases--Elevated--Temperatures--Pressures Résumé : In this communication, we report an extended artificial neural network algorithm to estimate sulfur content of sour/acid gases. The main advantage of this algorithm is that it eliminates any need for characterization parameters, due to the tendency of sulfurs to react, required in thermodynamic models. To develop this tool, reliable experimental data found in the literature on sulfur content of various gases are used. To estimate the sulfur content of a gas, the information on temperature, pressure, gravity of acid gas free gas, and the concentrations of hydrogen sulfide and carbon dioxide in the gas are required. The developed algorithm is then used to predict independent experimental data (not used in its development). It is shown that the artificial neural network algorithm can be used as an efficient tool to estimate sulfur content of various gases. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900399b [article] Extension of an artificial neural network algorithm for estimating sulfur content of sour gases at elevated temperatures and pressures [texte imprimé] / Mehdi Mehrpooya, Auteur ; Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur . - 2010 . - pp. 439–442. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 439–442 Mots-clés : Extension--Artificial--Neural--Network--Algorithm--Estimating--Sulfur--Gases--Elevated--Temperatures--Pressures Résumé : In this communication, we report an extended artificial neural network algorithm to estimate sulfur content of sour/acid gases. The main advantage of this algorithm is that it eliminates any need for characterization parameters, due to the tendency of sulfurs to react, required in thermodynamic models. To develop this tool, reliable experimental data found in the literature on sulfur content of various gases are used. To estimate the sulfur content of a gas, the information on temperature, pressure, gravity of acid gas free gas, and the concentrations of hydrogen sulfide and carbon dioxide in the gas are required. The developed algorithm is then used to predict independent experimental data (not used in its development). It is shown that the artificial neural network algorithm can be used as an efficient tool to estimate sulfur content of various gases. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900399b

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Gas hydrate phase equilibrium in porous media / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 1062-1072 Titre : Gas hydrate phase equilibrium in porous media : Mathematical modeling and correlation Type de document : texte imprimé Auteurs : Amir H. Mohammadi, Auteur ; Ali Eslamimanesh, Auteur ; Dominique Richon, Auteur Année de publication : 2012 Article en page(s) : pp. 1062-1072 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Correlation analysis Modeling Porous medium Phase equilibrium Gas hydrates Résumé : In this paper, we present two different approaches to represent/predict the gas hydrate phase equilibria for the carbon dioxide, methane, or ethane + pure water system in the presence of various types of porous media with different pore sizes. The studied porous media include silica gel, mesoporous silica, and porous silica glass. First, a correlation is presented, which estimates the hydrate suppression temperature due to the pore effects from the ice point depression (IPD). In the second place, several mathematical models are proposed using the least squares support vector machine (LSSVM) algorithm for the determination of the dissociation pressures of the corresponding systems. The results indicate that although the applied correlation based on the (IPD) leads to obtaining reliable results for the gas hydrate systems in the presence of porous silica glass media, the developed LSSVM models seem to be more general due to their predictive capability over all of the investigated systems. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476439 [article] Gas hydrate phase equilibrium in porous media : Mathematical modeling and correlation [texte imprimé] / Amir H. Mohammadi, Auteur ; Ali Eslamimanesh, Auteur ; Dominique Richon, Auteur . - 2012 . - pp. 1062-1072. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 1062-1072 Mots-clés : Correlation analysis Modeling Porous medium Phase equilibrium Gas hydrates Résumé : In this paper, we present two different approaches to represent/predict the gas hydrate phase equilibria for the carbon dioxide, methane, or ethane + pure water system in the presence of various types of porous media with different pore sizes. The studied porous media include silica gel, mesoporous silica, and porous silica glass. First, a correlation is presented, which estimates the hydrate suppression temperature due to the pore effects from the ice point depression (IPD). In the second place, several mathematical models are proposed using the least squares support vector machine (LSSVM) algorithm for the determination of the dissociation pressures of the corresponding systems. The results indicate that although the applied correlation based on the (IPD) leads to obtaining reliable results for the gas hydrate systems in the presence of porous silica glass media, the developed LSSVM models seem to be more general due to their predictive capability over all of the investigated systems. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476439

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Gas hydrate phase equilibrium in the presence of ethylene glycol or methanol aqueous solution / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010)  

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Ice−clathrate hydrate−gas phase equilibria for air, oxygen, nitrogen, carbon monoxide, methane, or ethane + water system / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010)  

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Ice – clathrate hydrate – gas phase equilibria for argon + water and carbon dioxide + water systems / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011)  

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A mathematical model based on artificial neural network technique for estimating liquid water-hydrate equilibrium of water-hydrocarbon system / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008)  

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Mesure des équilibres de phases sous pression / Dominique Richon in Techniques de l'ingénieur JB, Vol. JB1 (Trimestriel)  

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Mesure des équilibres de phases sous pression / Dominique Richon (2012)

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Mesure des équilibres de phases sous pression: méthodes en circuit ouvert / Dominique Richon in Techniques de l'ingénieur JB, Vol. JB1 (Trimestriel)  

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Mesure des équilibres de phases sous pression / Dominique Richon (2012)

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Monodisperse thermodynamic model based on chemical + flory – huggins polymer solution theories for predicting asphaltene precipitation / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012)  

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Phase equilibria of clathrate hydrates of cyclopentane + hydrogen sulfide and cyclopentane + methane / Amir H. Mohammadi in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009)  

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